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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8653ba8f8db97331e7366f09371ec5f4ddb4b085b8a8e54566770bca4a6f21b0' 
  AND token = '3MW6zwxdeYI3xY+xRSwzUhdiW8OR2o06sHuftkZdM+g=' 
  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"
    }
  }
}