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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ca580066a86ec70a0ceba9d26f98431360cf4fe0d02b871a9d1c3bbe59732d' 
  AND token = 'E5ZY69NZxwpn738SGok2z2cRCzbJ+dBbZXu5VJl2PcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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