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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25c7eb50232efbf6a0d7f013e5c5f58847a61b8a83089ac340bec2d30c997ae' 
  AND token = 'IoWkTqgswLrJOE9yYAtO001E0miXE/jqneLIMNB6HE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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