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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca283d2493107227ab69f373948c3de3aff3d0c3ca9fddcba2f0d9281cecb1db' 
  AND token = 'aJMf36P07tf/y8pQBElj8kA/Gjp4mMqh99D5mqIN/n4=' 
  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"
    }
  }
}