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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c50b573f2e4da8fa9e6accf51f2935e9d5246268446c245d010d9c50479831' 
  AND token = 'dQ1q9n4S2gZoB/6C6lNbN2HneUVUfcq3obxkNkZegJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}