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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb037d833ad4e21536bfd9a42d5c1b217e250ba2b17ca420eff51386a589ab2' 
  AND token = '3PS0WDTj0z3UuFqFiJy6DD/0aqhRfEzL0tn8RWAgtAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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