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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cec315c8ca12a04ee01cd0984a111adc21a5e126ecb48e44114798906f0cfc7' 
  AND token = 'z7JDpU6gGne8a1zwoTYDHV4SR13MWTDCC86kcPMeWfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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