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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308791a1fba431618e6a746d84df2aa2ca15dd7304c5946e236f275f3e3f032f' 
  AND token = 'AI4Z5GnB2YS1Z3ZKQ0JIGUG1YOCcRBhrh+trbh5BvrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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