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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a6b66c0eff099b178326c2a0c2d82b19ae5659153441bb7540e69b408a070c' 
  AND token = 'Zb4fced+MuqmhP1N6REEVvXXLRe7lsVxoRQi8afwCfo=' 
  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"
    }
  }
}