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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14be37cd46a5bb8a36050f98399398d2d810dd5446c80845b1ced509337e823' 
  AND token = 'yFMZpxnX/ffTH6kyzVIxJc+i7/Umyf1vVSioWb0OObQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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