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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5c9a099c2afad206c28154fc5451073f84b68cb82eac032d5cdabf93801d33' 
  AND token = 'jDYqRhcbwogHZoOTcmItXJuZ3nJH4nHKWVCI3f4yyp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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