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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb92239f0f3553d7676c24aba4e12c4d45f03af809e812b361f6c933a24626d' 
  AND token = '0vUUyh/pwIDTiikz4H9Ryq15d7w9tb/6M3oZo/t3kB4=' 
  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"
    }
  }
}