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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a0725ff363ee709ff6f651c04357954fd8297c8e3f75b9c3a35415596c83f5' 
  AND token = 'tWwr01aoF9i0bmNMP2vDB9Dw2KQocpCkM0kHrGIo9NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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