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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f8051366a58d894392f9ae0777e10ec9373e1f42380b0721fd400a6cc9c437' 
  AND token = 'a4JAvyIUz9SLCe4ukpK4Q6fcRcHhbS13fisZWDszfCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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