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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdde4ebee206bc1da332b4a2db53e38b2dd049f19511e390585e6d0016333d8' 
  AND token = 'Xlw77YKEW2oNL4+/uALezfuNOhPTiVsM//BCBYzdTfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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