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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecd9a7f1736e351866684d2d507b9dc5001216ed8ad6dc2c19b2f38603ef532' 
  AND token = 'ioCE0KfMcIxAeo9X1DWs2qRwyqNYtlINM/REBVH7ofg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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