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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4dc5f8296582d7944c7be7855ccf9b66d5b8a475380c03ac830c5a3317ff4b' 
  AND token = '06Il0kO5EsoGFMlf+/OQMj1DBpOcGkxlZh7+1luiA28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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