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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f5951cfe84de2901e4a74f61176338c31d9aa3bff5fc4c761541ba1d92864d' 
  AND token = 'aDEDcr+ngXQ6FEe+C03LGylZ3h0nEGDPlvVMnrlWC8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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