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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce5cdfc0efe8f7f291f6eca7d9f04d53606dbc5c08b011d92d64c4aae71de37' 
  AND token = 'TVd/pQEfWFyQ0QXLniJjFCC2wK2ndgj/my7TOmIf9SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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