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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7dacc263cfac4cd70aaeda4d9f0b82b615ff1986c14b498f49efbe4245c4bae' 
  AND token = 'b6U5Wwto2KVkJ5whNp2ofqgj5o0V8/8o8WxGnuZcb1E=' 
  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"
    }
  }
}