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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71baf21b866a8d8d89839f1a52125f0b3a9d16eb0d374f7c5ae8fd7237a2fe23' 
  AND token = 'HQSYLy6I9LAl83Bt4kvWmm1JC8e9e0ytxMYsj7m3hDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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