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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054c54dee48d14e37e59874dd6be9e013fb4a0b8c8aa141211146216c1aea7fc' 
  AND token = 'K7qdmXDIhTFJoxoixkhSekrs3nFcbkxUKCqvsIPHKxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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