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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1728697126f0e36486f0a114e508f269f73f12ff58725c6360be805d1c58ed' 
  AND token = 'D15GRhOQYLqmqxilwa2DjEOOZA8X0Ff08mz+6aMlMjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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