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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d485f9ed16f33df964d9f38914379bcb78547f740e4114fd03f1a011e661c4' 
  AND token = 'PGUxggLPEnxn4F/rj2LpT28pIM4tZlg8pNJ3ppfKOW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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