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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e526eb442c5047102861aca1647d5275ffba88ed5d5d0d78a59f477e1904dc' 
  AND token = '0Q9lCEL+xc19hd+t0VBUAN9GW+Zt9KaRDbgYQeO9QR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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