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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3411b29528b59d8e0d425435722968d6bb7bd2a5c326918ca4a6c28b17204ab1' 
  AND token = 'PrQdnnvpAPR7qlQsy5W78K//cT6OUM8R05ATBUmx9ro=' 
  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"
    }
  }
}