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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bb52bc1a42dfc2cdcc3a448461f8efdf6ae0cc0012eb2dace2fc4ec77d27b4' 
  AND token = 'Ia9pvckeAVQRAtu6ayS476m6J0ESM8xSWAWP7BdqAmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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