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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55b75d648edff064b56a58b2189b43cdc88a0f366accbaad669aafc5281cc3e' 
  AND token = 'h2sUCYv962ACubz10tNATOZ5YwVOTxbVAjS0+i9eIXM=' 
  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"
    }
  }
}