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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3721e6c9e67f6320e464edd2eee02c01c2d7596229534a73dd894befdd6392a5' 
  AND token = '4WlffAFR+2LFgM3yqzu3W+BMSlgHrokYSG6xDfqdkQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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