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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9124cd7fe39948b153e3819d8944c3c015bba44f7d405394cccd86305992e47' 
  AND token = 'oU+3Z6cPvkxIdL7NySxIGsR0XMM5pYJrPn/+5/URTqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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