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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20254220ed693b3c0ee46c1cdae333988c6515312dd6019c0bc3301fb26a7515' 
  AND token = '+9sLBD1KvvEKInCZAC7qbycgmDMQzNtv8roOw5Ns3hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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