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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3641ff957d030b7759c19044a04c02fd473444049fce44518b028517a19f040' 
  AND token = '4zOEm3TSoZD0Z7JGd1Q/Z1m2h8iwttJUp5Wt9PGye1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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