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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb1e79a67e245e6bcd0005945bbad8de8e4147e3eeeec8b5b0170018e98d843' 
  AND token = 'U5US5SVagbP8DoDMb/daKoP236BozW9OoqhFIwB6p5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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