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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61f0487a1fbb455f5ed975e3669fa17fbec861eef6a272d5c7ceef23ea103b2' 
  AND token = 'ZsmBd0qdC2syVn3ofIh/uD7qzlo4p58I0L+98ng3xBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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