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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0b4c9a0c207f5f35bc83372f7d147fd41f46d699766d444a0e54d839cb40d5' 
  AND token = 'VaIL3WL1VVP3VBQgkg63Wzb3NaE9F5+aaRcTtiZPD+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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