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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8079f0a3a08e385a14f5908471b30ef4f89f6460e9ef370b4e3e9f93f7088b' 
  AND token = 'Guiv+eTpIGAhfGWdQnraHFvQHogklZ/17c4qt00a1Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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