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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c665de5da0490cd01c3821eb2de09c88f2cde0a628c12689be3a5d882f256dbf' 
  AND token = 'iy6J2haw8U3Lowwxgw2lZFlHY04V2qtlZjLHvg/cEK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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