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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bdf3b19e11bc6b111e7366e3fc9c664651a7554923558e51d2875a086945c1' 
  AND token = 'FH6EOkctD86QqplaR6sq0arFtiJO2AKco+caj4LPXT8=' 
  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"
    }
  }
}