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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d70da54e452199a33f73f18d61a8a3f74f6bb48b2902a0b214080713143e3c3' 
  AND token = 'URHWmuI3bnrb2Z8lTA7rP7FgKOIrBDCIUQ38cj62djA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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