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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564c5918410460d5be63d56e90e5967d83f61058bcf621d674bcccff81d09d91' 
  AND token = '+JNrJ8FhexmSur2sMo4tJ0NhV01QkCAQ07Q9j6A1sMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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