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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ef9ae10af5c5b6d38a1a8a695e512a85dcbd29e53b2fb57b5effc29db9672a' 
  AND token = '5eRvZ545gRx6q+k82N/ZMsvDt6OezAT0GO9yYljd0YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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