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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c905c33a9d4f0292df4ffbf1ec4bf0604bd6131ea3387008356e0721d3cf7bf' 
  AND token = '9Uw5rHvYfhk4u12dtdHxWtkYhpPe+ie/N0S4OGKy/ic=' 
  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"
    }
  }
}