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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd73b5fed8ae0fa280a9409af734cb7ce425e352d13a6c5d3a4c7f3b831e25a8' 
  AND token = '9q60OTozJXKIYcobag4o0+b3JjdWagTDjdRAIU8qNcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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