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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b4af4de00b7d6abcb44e9b1a9f17f2117df1d4899fcb2f69a65c608cbd488b' 
  AND token = 'kBW+SWycNQ9LsEAEBW1zzboivxw8LnrZZ/83TEWdaSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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