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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1fa5bad80d49069b6af5ce3b2b68f00ae7823b8fdf3a6b9ccad934e8e8480e' 
  AND token = 'fpFQC98+FYS73AsjVOUi2Q5IA7j7muJl27W6Xw5enBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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