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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52dc0ab130d770966002b3886c54da8e20baf06bc28c7fc7f1e037aee95c8a44' 
  AND token = 'F9TLNERu2OhEcGC89o67j0ZBZI+f7j9q3liKa3t5Axs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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