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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9a7e02be0894947463169b3c88ebbd2c11a6507b9fb18ff508b1a6387854e2' 
  AND token = 'SnkyG/peLAhSMe2aq0Gtfz4BhqiFyQ0hIx0UFC2Jg70=' 
  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"
    }
  }
}