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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bd3b45b1a44c5edbacb68aba35a14cdedc5845f9a2ddba26e6f73bec5facaf' 
  AND token = 'SCav225Kz0xNPsrH5dsfSu1dLVn5XjN490MIWkMus2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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