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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20fb03ff049dec973c91ce89dd52d2a53bf7b8a58c97aebcc38ed8893fa60ac5' 
  AND token = '3vt38cGBis5WI7IAMo908BRDuY+E28/9W6gAqlz/Wpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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