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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6aa69046a3b4cd0541c87fb26d7bb7eb3c8495a761b6715871498d9b09c7d89' 
  AND token = '2zNsF54eI3kEPebOsD2reiMjqhNhfBgnolh/W9By1/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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